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WO2000022363A1 - Gas seal for continuous thermal treatment facilities operated with a protective gas atmosphere - Google Patents

Gas seal for continuous thermal treatment facilities operated with a protective gas atmosphere Download PDF

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Publication number
WO2000022363A1
WO2000022363A1 PCT/DE1999/002667 DE9902667W WO0022363A1 WO 2000022363 A1 WO2000022363 A1 WO 2000022363A1 DE 9902667 W DE9902667 W DE 9902667W WO 0022363 A1 WO0022363 A1 WO 0022363A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
metal strip
slot nozzles
seal according
nozzles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/DE1999/002667
Other languages
German (de)
French (fr)
Inventor
Winfried Sommereisen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Otto Junker GmbH
Original Assignee
Otto Junker GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Otto Junker GmbH filed Critical Otto Junker GmbH
Priority to JP2000576225A priority Critical patent/JP2002527622A/en
Priority to EP99953600A priority patent/EP1040309B1/en
Priority to CA002314143A priority patent/CA2314143C/en
Priority to AT99953600T priority patent/ATE259049T1/en
Priority to DE59908467T priority patent/DE59908467D1/en
Priority to US09/581,370 priority patent/US6517079B1/en
Publication of WO2000022363A1 publication Critical patent/WO2000022363A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals
    • F27D99/0075—Gas curtain seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/28—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity for treating continuous lengths of work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/906—Seal for article of indefinite length, e.g. strip, sheet

Definitions

  • the invention relates to an aerodynamic sealing of continuous heat treatment systems with a protective gas atmosphere with an opening cross section of the continuous heat treatment system which limits a sealing cross section and is directed onto a continuous metal strip.
  • aerodynamic seals are therefore used in which a gas jet separates the two gas zones from one another.
  • the solution requires that the double slot nozzle or nozzles be positioned as close as possible to the surface of the continuous belt in order to achieve a good sealing effect.
  • the double slit nozzles must therefore be arranged at a certain minimum distance from the conveyor belt and have a corresponding slit width. Nevertheless, air and shielding gas can mix, so that shielding gas losses occur on the one hand and air can get into the furnace on the other hand.
  • an aerodynamic seal for example for continuous furnaces, is known from DE 44 41 690 A1.
  • two gases which emerge in parallel from a two-part chamber, form a gas curtain perpendicular to a conveyor belt.
  • This embodiment includes the disadvantages of the sealing from DE-PS 37 43 598 listed above.
  • it has proven disadvantageous to divide the chamber outlet opening into small openings by means of a perforated plate, which causes a sealing gas jet of lower flow velocity.
  • Such a sealing gas jet is not very suitable for counteracting a flow impulse from a system operated with inert gas.
  • a seal in the form of sealing air jets is known from DE-PS 973 548, which is used on revolving regenerative heat exchangers.
  • warm flue gas and cool air flowing counter to it are passed through a rotor provided with heating plates. Flue gas and air are separated by means of sealing air jets.
  • the nozzles for this are arranged between the flue gas and the air area above and below the rotor. From them, sealing air is blown through the rotor at high speed and this sealing air is then sucked out again.
  • the sealing air jet generated in this way is unsuitable for strips, since a strip - unlike a rotor provided with heating plates - cannot be penetrated by a sealing air jet.
  • the invention has for its object to provide an aerodynamic seal of the type mentioned, with which the mixing of the ⁇ involved gases is further reduced.
  • each side of the metal strip is assigned two separate slot nozzles which are arranged one behind the other in the direction of travel of the metal strip and each produce a gas jet which is directed perpendicularly to the metal strip or directed away from one another at an angle and directed towards the metal strip, of which the nozzle directed towards the atmosphere side Slot nozzles are pressurized with air and the slot nozzles directed towards the side of the continuous heat treatment system are supplied with protective gas.
  • the slot nozzles are preferably arranged so as to be rotatable in order to adjust their angle. They are expediently arranged on tubular, rotatably mounted gas supply bodies connected to gas channels. Compared to the respectively assigned gas channel, they are sealed, for example, on both sides with a plate-shaped seal and provided with an opening slot towards the longitudinal axis of the respective gas channel.
  • the beam axis can thus be adjusted to the conditions that result from the continuous belt to be treated.
  • the twisting also makes it possible to change the distance between the slot nozzles and the metal strip.
  • both gas jets of the laterally adjacent slot nozzles can be set. This can also easily create a pressure equalization between the two gas zones when working in a gas zone with a higher pressure, as is usually the case with the continuous furnaces described.
  • the slot nozzles can then be operated not only with different jet angles, but also with different gas pressures. If a pressure seal going beyond this is required, the arrangement can be supplemented, as in the previously known manner, by additional pressure nozzles which are positioned between the slot nozzle arrangement described here and the pressurized chamber. The jet axis of the pressure nozzles is twisted in the direction of the chamber. In order to then reduce the gas pressure in the area between the slot nozzles and the pressure nozzles, a suction device must be provided there.
  • a turbulent gas mixture builds up between the two gas components involved, which, however, can only overcome the opening cross section to be sealed with very small amounts of gas.
  • a suction device and / or a burner can be arranged in the area between the slot nozzles on each side of the metal strip, so that a slightly lower pressure is established in this space by suctioning off the gas mixture than, for example, in the furnace chamber or it the proportion of oxygen in this gas mixture is burned sub-stoichiometrically.
  • Another variant is to introduce protective gas into this room.
  • One way to further limit the mixing in the space between the slot nozzles is to divide this space by a partition wall running perpendicular to the metal strip passing through and coming close to it.
  • the gas passage between the two gas zones can also be further reduced by keeping the space between the slot nozzles as small as possible by leaving only a narrow channel between the slot nozzles.
  • the slot nozzles are expediently connected in each case by a cover parallel to the continuous metal strip.
  • the associated drawing shows the cross-section of the passage area of a continuous furnace for the heat treatment of sheet metal strips with an aerodynamic seal.
  • the continuous furnace is provided with a furnace wall 1, in which a band passage 2 for a sheet metal band 3 is left.
  • the direction of passage is indicated by an arrow.
  • the continuous furnace is operated under a protective gas atmosphere.
  • the aerodynamic seal consists of two slot nozzles 13, 14 and 15, 16 on both sides of the sheet metal strip 3, which are arranged on gas supply bodies 4 and 5 or 6 and 7.
  • the slot nozzles 13 and 15 directed towards the furnace are charged with protective gas, and the slot nozzles 14 and 16 directed towards the outside are charged with air.
  • the gas supply bodies 4 to 7 are constructed from pipe sections 8 which are rotatably mounted on axes 9. They are sealed off from blow boxes 10 forming gas channels by means of sealing plates 11. To guide the gas, they are provided with through openings 12 on the sides which protrude into the blow boxes 10.
  • the entire arrangement is connected to the furnace wall 1 via screw connections 17.
  • the sheet metal strip 3 forms a baffle plate for the nozzle arrangement.
  • a gas mixture of protective gas and air is formed, the mixing of which is limited by a separating plate 18.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Furnace Details (AREA)
  • Sealing Material Composition (AREA)

Abstract

The invention relates to an aerodynamic seal in which two separate slit nozzles (13, 14; 15, 16) are assigned to each side of the metal strip (3) which is fed into the facility. Said slit nozzles are arranged successively at a distance from one another in the direction of passage of the metal band (3) and generate a gas jet which impinges the metal band (3) in a perpendicular direction. They can also be arranged so that they face away from one another and impinge the metal band (3) at an angle. The slit nozzles (14, 16) facing the protective gas atmosphere are supplied with air and the slit nozzles (13, 15) facing the continuous thermal treatment facility are supplied with protective gas. The seals are suitable for continuous thermal treatment facilities and other facilities in which two gas zones should be sealed from one another by means other than a mechanical seal.

Description

GASDICHTUNG VON DURCHLAUF-WÄRMEBEHANDLUNGSANLAGEN MIT SCHUTZGASATMOSHPHARE GAS SEAL OF CONTINUOUS HEAT TREATMENT PLANTS WITH PROTECTIVE GAS ATMOSPHERES

Beschreibungdescription

Die Erfindung betrifft eine aerodynamische Abdichtung von Durchlauf-Wärmebehand- lungsanlagen mit Schutzgasatmosphäre mit einen abzudichtenden Öffnungsquerschnitt der Durchlauf-Wärmebehandlungsanlage begrenzenden, auf ein durchlaufendes Metallband gerichteten Schlitzdüsen.The invention relates to an aerodynamic sealing of continuous heat treatment systems with a protective gas atmosphere with an opening cross section of the continuous heat treatment system which limits a sealing cross section and is directed onto a continuous metal strip.

Bei verschiedenen Industrieanlagen werden berührungslose Abdichtungen zwischen zwei Gaszonen gefordert. So besteht entweder das Problem, daß Gase oder Dämpfe, die innerhalb einer Kammer entstehen, nicht in die Außenatmosphäre gelangen sollen oder daß atmosphärische Luft beispielsweise nicht in eine mit Schutzgas beaufschlagte Kammer hingetragen werden soll. Trotzdem soll die Kammer frei zugänglich sein, um das zu behandelnde, berührungsempfindliche Gut zuführen zu können.In various industrial plants, contactless seals between two gas zones are required. There is either the problem that gases or vapors that arise within a chamber should not get into the outside atmosphere or that atmospheric air, for example, should not be carried into a chamber charged with protective gas. Nevertheless, the chamber should be freely accessible in order to be able to supply the touch-sensitive material to be treated.

In Durchlauföfen für Blechbänder besteht beispielsweise eine solche Forderung. Die Wärmebehandlung leicht oxidierender Bleche erfolgt im Ofen unter Schutzgas. Aufgrund der Oberflächenempfindlichkeit der Blechbänder soll von einer mechanischen Dichtung der Ofenöffnung gegenüber der Außenatmosphäre jedoch möglichst abgesehen werden.Such a requirement exists, for example, in continuous furnaces for sheet metal strips. The heat treatment of slightly oxidizing sheets is carried out in an oven under protective gas. Due to the surface sensitivity of the metal strips, however, mechanical sealing of the furnace opening from the outside atmosphere should be avoided as far as possible.

In den vorgenannten Fällen werden deshalb aerodynamische Abdichtungen eingesetzt, bei denen ein Gasstrahl die beiden Gaszonen voneinander trennt.In the aforementioned cases, aerodynamic seals are therefore used in which a gas jet separates the two gas zones from one another.

Aus der DE-PS 37 43 598 ist eine aerodynamische Abdichtung mit einer Doppelschlitz- düse bekannt. Die Düse hat eine mittlere Trennwand, durch die zwei Düsenräume geschaffen werden, in die jeweils das Gas der voneinander abzudichtenden Gaszonen eingeleitet wird. Der Gasstrahl mit seinen beiden Teilstrahlen trifft mit seinem Kernbereich auf eine Prallfläche, die z.B. durch das in einen Durchlaufofen einlaufende Blech- band gebildet wird. Da in dem Kernbereich des Gasstrahls nur eine geringe Turbulenz herrscht, soll eine Vermischung von Schutzgas und Luft weitgehend vermieden werden.From DE-PS 37 43 598 an aerodynamic seal with a double slot nozzle is known. The nozzle has a central partition, through which two nozzle spaces are created, into each of which the gas from the gas zones to be sealed is introduced. The core region of the gas jet with its two partial jets strikes an impact surface, which is caused, for example, by the sheet metal entering a continuous furnace. band is formed. Since there is only slight turbulence in the core area of the gas jet, mixing of protective gas and air should be largely avoided.

Die Lösung erfordert, daß die Doppelschlitzdüse bzw. -düsen möglichst nahe an der Oberfläche des durchlaufenden Bandes positioniert werden, um eine gute Dichtwirkung zu erreichen. Da derartige Bänder jedoch nie völlig eben sind, sondern Ausbeulungen und Wenigkeiten aufweisen und bei den erreichten Durchlaufgeschwindigkeiten auch kleine Bandbewegungen senkrecht zur Bandoberfläche auftreten, läßt sich diese Forderung nicht ohne weiteres einhalten. Die Doppelschlitzdüsen müssen deshalb in einem bestimmten Mindestabstand vom durchlaufenden Band angeordnet werden und dafür eine entsprechende Schlitzbreite aufweisen. Trotzdem kann es zu Vermischungen von Luft und Schutzgas kommen, so daß einerseits Schutzgasverluste auftreten und andererseits Luft in den Ofen gelangen kann.The solution requires that the double slot nozzle or nozzles be positioned as close as possible to the surface of the continuous belt in order to achieve a good sealing effect. However, since such belts are never completely flat, but have bulges and little, and at the throughput speeds also small belt movements occur perpendicular to the belt surface, this requirement cannot be easily met. The double slit nozzles must therefore be arranged at a certain minimum distance from the conveyor belt and have a corresponding slit width. Nevertheless, air and shielding gas can mix, so that shielding gas losses occur on the one hand and air can get into the furnace on the other hand.

Weiter ist aus der DE 44 41 690 A1 eine aerodynamische Abdichtung, beispielsweise für Durchlauföfen, bekannt. Auch hier bilden zwei Gase, welche parallel aus einer zweigeteilten Kammer austreten, einen Gasvorhang senkrecht zu einem Förderband. Diese Ausführung beinhaltet die oben aufgeführten Nachteile der Abdichtung aus DE-PS 37 43 598. Zusätzlich unvorteilhaft erweist sich hier eine Unterteilung der Kammeraus- trittsöffnung mittels einer Lochplatte in Kleinstöffnungen, die einen Sperrgasstrahl geringerer Strömungsgeschwindigkeit bewirkt. Ein derartiger Sperrgasstrahl ist wenig geeignet, einem Strömungsimpuls aus einem mit Inertgas betriebenen System entgegenzuwirken.Furthermore, an aerodynamic seal, for example for continuous furnaces, is known from DE 44 41 690 A1. Here, too, two gases, which emerge in parallel from a two-part chamber, form a gas curtain perpendicular to a conveyor belt. This embodiment includes the disadvantages of the sealing from DE-PS 37 43 598 listed above. In addition, it has proven disadvantageous to divide the chamber outlet opening into small openings by means of a perforated plate, which causes a sealing gas jet of lower flow velocity. Such a sealing gas jet is not very suitable for counteracting a flow impulse from a system operated with inert gas.

Weiter ist aus der DE-PS 973 548 eine Abdichtung in Form von Sperrluftstrahlen bekannt, welche an umlaufenden Regenerativ-Wärmetauschern zum Einsatz kommt. Hierbei werden nebeneinander durch einen mit Heizplatten versehenen Rotor warmes Rauchgas und diesem gegenströmende, kühle Luft durchgeleitet. Eine Trennung von Rauchgas und Luft erfolgt mittels Sperrluftstrahlen. Die Düsen hierzu sind zwischen dem Rauchgas- und dem Luftbereich ober- und unterhalb des Rotors angeordnet. Aus ihnen wird mit großer Geschwindigkeit durch den Rotor Sperrluft hindurchgeblasen und diese Sperrluft anschließend wieder abgesaugt. Der so erzeugte Sperrluftstrahl ist für Bänder ungeeignet, da ein Band -ungleich einem mit Heizplatten versehenen Rotor- nicht von einem Sperrluftstrahl durchdrungen werden kann. Der Erfindung liegt die Aufgabe zugrunde, eine aerodynamische Abdichtung der eingangs genannten Art anzugeben, mit der die Vermischung der^ beteiligten Gase weiter gesenkt wird.Furthermore, a seal in the form of sealing air jets is known from DE-PS 973 548, which is used on revolving regenerative heat exchangers. Here, warm flue gas and cool air flowing counter to it are passed through a rotor provided with heating plates. Flue gas and air are separated by means of sealing air jets. The nozzles for this are arranged between the flue gas and the air area above and below the rotor. From them, sealing air is blown through the rotor at high speed and this sealing air is then sucked out again. The sealing air jet generated in this way is unsuitable for strips, since a strip - unlike a rotor provided with heating plates - cannot be penetrated by a sealing air jet. The invention has for its object to provide an aerodynamic seal of the type mentioned, with which the mixing of the ^ involved gases is further reduced.

Erfindungsgemäß wird die Aufgabe dadurch gelöst, daß jeder Seite des Metallbandes zwei separate, in Durchlaufrichtung des Metallbandes mit Abstand hintereinander angeordnete, jeweils einen senkrecht auf das Metallband oder voneinander weggerichtet winklig auf das Metallband gerichteten Gasstrahl erzeugende Schlitzdüsen zugeordnet sind, von denen die zur Atmosphärenseite gerichteten Schlitzdüsen mit Luft und die zur Seite der Durchlauf-Wärmebehandlungsanlage hin gerichteten Schlitzdüsen mit Schutzgas beaufschlagt sind.According to the invention the object is achieved in that each side of the metal strip is assigned two separate slot nozzles which are arranged one behind the other in the direction of travel of the metal strip and each produce a gas jet which is directed perpendicularly to the metal strip or directed away from one another at an angle and directed towards the metal strip, of which the nozzle directed towards the atmosphere side Slot nozzles are pressurized with air and the slot nozzles directed towards the side of the continuous heat treatment system are supplied with protective gas.

Vorzugsweise sind die Schlitzdüsen zur Einstellung ihres Winkels drehbeweglich ange- ordnet. Sie sind zweckmäßig an rohrförmigen, drehbar gelagerten und mit Gaskanälen verbundenen Gaszuführungskörpern angeordnet. Gegenüber dem jeweils zugeordneten Gaskanal sind sie beispielsweise zu beiden Seiten mit einer plattenförmigen Dichtung abgedichtet und zur Längsachse des jeweiligen Gaskanals hin mit einem Öffnungsschlitz versehen.The slot nozzles are preferably arranged so as to be rotatable in order to adjust their angle. They are expediently arranged on tubular, rotatably mounted gas supply bodies connected to gas channels. Compared to the respectively assigned gas channel, they are sealed, for example, on both sides with a plate-shaped seal and provided with an opening slot towards the longitudinal axis of the respective gas channel.

Die Strahlachse kann somit auf die Bedingungen eingestellt werden, die sich durch das jeweils zu behandelnde durchlaufende Band ergeben. Durch die Verdrehung wird gleichzeitig die Veränderung des Abstandes zwischen den Schlitzdüsen und dem Metallband möglich.The beam axis can thus be adjusted to the conditions that result from the continuous belt to be treated. The twisting also makes it possible to change the distance between the slot nozzles and the metal strip.

Vorteilhaft ist, daß sich unterschiedliche Winkel beider Gasstrahlen der seitlich benachbarten Schlitzdüsen einstellen lassen. Damit läßt sich auch auf einfache Weise ein Druckausgleich zwischen den beiden Gaszonen schaffen, wenn in einer Gaszone mit einem höheren Druck gearbeitet wird, wie es bei den beschriebenen Durchlauföfen in der Regel der Fall ist. Die Schlitzdüsen können in diesem Fall dann auch nicht nur mit verschiedenem Strahlwinkel, sondern auch mit unterschiedlichem Gasdruck betrieben werden. Ist eine darüber hinausgehende Druckabdichtung erforderlich, so kann die Anordnung wie in bisher bekannter Weise durch zusätzliche Druckdüsen ergänzt werden, die zwischen der hier beschriebenen Schlitzdüsenanordnung und derjriit Druck beaufschlagten Kammer positioniert werden. Die Strahlachse der Druckdüsen ist in Richtung auf die Kammer verdreht. Um den Gasdruck im Bereich zwischen den Schlitzdüsen und den Druckdüsen dann abzubauen, ist dort jeweils eine Absaugeinrichtung vorzusehen.It is advantageous that different angles of both gas jets of the laterally adjacent slot nozzles can be set. This can also easily create a pressure equalization between the two gas zones when working in a gas zone with a higher pressure, as is usually the case with the continuous furnaces described. In this case, the slot nozzles can then be operated not only with different jet angles, but also with different gas pressures. If a pressure seal going beyond this is required, the arrangement can be supplemented, as in the previously known manner, by additional pressure nozzles which are positioned between the slot nozzle arrangement described here and the pressurized chamber. The jet axis of the pressure nozzles is twisted in the direction of the chamber. In order to then reduce the gas pressure in the area between the slot nozzles and the pressure nozzles, a suction device must be provided there.

In dem Raum zwischen seitlich benachbarten Schlitzdüsen der erfindungsgemäßen Anordnung baut sich ein turbulentes Gasgemisch zwischen beiden beteiligten Gaskom- ponenten auf, das aber den abzudichtenden Öffnungsquerschnitt nur mit sehr kleinen Gasmengen zu überwinden vermag. Um auch dieses noch zu vermindern, kann im Bereich zwischen den Schlitzdüsen auf jeder Seite des Metallbandes eine Absaugeinrichtung und/oder ein Brenner angeordnet sein, so daß sich in diesem Raum durch Absaugen des Gasgemisches ein gerinfügig geringerer Druck einstellt als beispielsweise in der Ofenkammer oder es wird der Sauerstoffanteil in diesem Gasgemisch unter- stöchiometrisch verbrannt. Eine andere Variante ist, in diesen Raum Schutzgas einzuleiten.In the space between laterally adjacent slot nozzles of the arrangement according to the invention, a turbulent gas mixture builds up between the two gas components involved, which, however, can only overcome the opening cross section to be sealed with very small amounts of gas. In order to reduce this even further, a suction device and / or a burner can be arranged in the area between the slot nozzles on each side of the metal strip, so that a slightly lower pressure is established in this space by suctioning off the gas mixture than, for example, in the furnace chamber or it the proportion of oxygen in this gas mixture is burned sub-stoichiometrically. Another variant is to introduce protective gas into this room.

Eine Möglichkeit, die Vermischung in dem Raum zwischen den Schlitzdüsen weiter zu begrenzen, ist, diesen Raum jeweils durch eine senkrecht zum durchlaufenden Metallband verlaufende und nahe an dieses heranreichende Trennwand zu teilen.One way to further limit the mixing in the space between the slot nozzles is to divide this space by a partition wall running perpendicular to the metal strip passing through and coming close to it.

Der Gasdurchtritt zwischen den beiden Gaszonen läßt sich auch dadurch weiter vermindern, daß der Raum zwischen den Schlitzdüsen möglichst klein gehalten wird, in- dem zwischen den Schlitzdüsen nur ein enger Kanal belassen wird. Die Schlitzdüsen werden dazu zweckmäßig jeweils durch eine zum durchlaufenden Metallband parallele Abdeckung verbunden.The gas passage between the two gas zones can also be further reduced by keeping the space between the slot nozzles as small as possible by leaving only a narrow channel between the slot nozzles. For this purpose, the slot nozzles are expediently connected in each case by a cover parallel to the continuous metal strip.

Die Erfindung soll an einem Ausführungsbeispiel näher erläutert werden. Die zugehö- rige Zeichnung zeigt den Durchlaßbereich eines Durchlaufofens für die Wärmebehandlung von Blechbändern mit einer aerodynamischen Abdichtung im Querschnitt. Der Durchlaufofen ist mit einer Ofenwand 1 versehen, in der ein Banddurchlaß 2 für ein Blechband 3 belassen ist. Die Durchlaufrichtung ist durch einen Pfeil angedeutet. Der Durchlaufofen wird unter Schutzgasatmosphäre betrieben.The invention will be explained in more detail using an exemplary embodiment. The associated drawing shows the cross-section of the passage area of a continuous furnace for the heat treatment of sheet metal strips with an aerodynamic seal. The continuous furnace is provided with a furnace wall 1, in which a band passage 2 for a sheet metal band 3 is left. The direction of passage is indicated by an arrow. The continuous furnace is operated under a protective gas atmosphere.

Die aerodynamische Abdichtung besteht aus jeweils zwei Schlitzdüsen 13, 14 und 15, 16 zu beiden Seiten des Blechbandes 3, die an Gaszuführungskörpern 4 und 5 bzw. 6 und 7 angeordnet sind. Die zur Ofenseite gerichteten Schlitzdüsen 13 und 15 werden mit Schutzgas, die zur Außenseite gerichteten Schlitzdüsen 14 und 16 werden mit Luft beschickt.The aerodynamic seal consists of two slot nozzles 13, 14 and 15, 16 on both sides of the sheet metal strip 3, which are arranged on gas supply bodies 4 and 5 or 6 and 7. The slot nozzles 13 and 15 directed towards the furnace are charged with protective gas, and the slot nozzles 14 and 16 directed towards the outside are charged with air.

Die Gaszuführungskörper 4 bis 7 sind aus Rohrabschnitten 8 aufgebaut, die auf Achsen 9 drehbeweglich gelagert sind. Gegenüber Gaskanäle bildenden Blaskästen 10 sind sie mittels Dichtplatten 11 abgedichtet. Zur Gasführung sind sie an den Seiten, die in die Blaskästen 10 hineinragen mit Durchlaßöffnungen 12 versehen.The gas supply bodies 4 to 7 are constructed from pipe sections 8 which are rotatably mounted on axes 9. They are sealed off from blow boxes 10 forming gas channels by means of sealing plates 11. To guide the gas, they are provided with through openings 12 on the sides which protrude into the blow boxes 10.

Die gesamte Anordnung ist über Schraubverbindungen 17 mit der Ofenwand 1 verbunden.The entire arrangement is connected to the furnace wall 1 via screw connections 17.

Das Blechband 3 bildet für die Düsenanordnung eine Prallplatte. Im Raum zwischen den Schlitzdüsen 13 und 14 bzw. 15 und 16 bildet sich ein Gasgemisch aus Schutzgas und Luft, dessen Vermischung durch ein Trennbiech 18 begrenzt wird. The sheet metal strip 3 forms a baffle plate for the nozzle arrangement. In the space between the slot nozzles 13 and 14 or 15 and 16, a gas mixture of protective gas and air is formed, the mixing of which is limited by a separating plate 18.

Claims

Ansprüche Expectations 1. Aerodynamische Abdichtung von Durchlauf-Wärmebehandlungsanlagen mit Schutzgasatmosphäre mit einen abzudichtenden Öffnungsquerschnitt der Durchlauf- Wärmebehandlungsanlage begrenzenden, auf ein durchlaufendes Metallband (3) gerichteten Schlitzdüsen, dadurch gekennzeichnet, daß jeder Seite des Metallbandes (3) zwei separate, in Durchlaufrichtung des Metallbandes (3) mit Abstand hintereinander angeordnete, jeweils einen senkrecht auf das Metallband (3) oder voneinander weggerichtet winklig auf das Metallband (3) gerichteten Gasstrahl erzeugende Schlitzdüsen (13, 14; 15, 16) zugeordnet sind, von denen die zur Atmosphärenseite gerichteten Schlitzdüsen (14, 16) mit Luft und die zur Seite der Durchlauf-Wärmebehandlungsan- lage hin gerichteten Schlitzdüsen (13, 15) mit Schutzgas beaufschlagt sind.1. Aerodynamic sealing of continuous heat treatment plants with a protective gas atmosphere with an opening cross-section to be sealed of the continuous heat treatment plant, directed towards a continuous metal strip (3), slot nozzles, characterized in that each side of the metal strip (3) has two separate, in the direction of flow of the metal strip (3 ) are arranged at a distance from one another, each producing a gas jet perpendicular to the metal strip (3) or directed away from one another at an angle directed onto the metal strip (3), of which the slot nozzles (14 , 16) with air and the slit nozzles (13, 15) facing the side of the continuous heat treatment system are exposed to protective gas. 2. Aerodynamische Abdichtung nach Anspruch 1 , dadurch gekennzeichnet, daß die Schlitzdüsen (13, 14; 15, 16) drehbeweglich angeordnet sind.2. Aerodynamic seal according to claim 1, characterized in that the slot nozzles (13, 14; 15, 16) are rotatably arranged. 3. Aerodynamische Abdichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Schlitzdüsen (13, 14; 15, 16) an rohrförmigen, drehbar gelagerten und mit Gaskanälen (10) verbundenen Gaszuführungskörpern (4, 5, 6, 7) angeordnet sind.3. Aerodynamic seal according to claim 2, characterized in that the slot nozzles (13, 14; 15, 16) on tubular, rotatably mounted and with gas channels (10) connected gas supply bodies (4, 5, 6, 7) are arranged. 4. Aerodynamische Abdichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Gaszuführungskörper (4, 5, 6, 7) gegenüber dem jeweils zugeordneten Gaskanal (10) beidseitig mit einer plattenförmigen Dichtung (11) abgedichtet und zur Längsachse des jeweiligen Gaskanals (10 ) hin mit einem Öffnungsschlitz (12) versehen sind.4. Aerodynamic seal according to claim 3, characterized in that the gas supply body (4, 5, 6, 7) with respect to the respectively assigned gas channel (10) sealed on both sides with a plate-shaped seal (11) and towards the longitudinal axis of the respective gas channel (10) are provided with an opening slot (12). 5. Aerodynamische Abdichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß in dem Raum zwischen seitlich benachbarten Schlitzdüsen (13, 14; 15, 16) eine Absaugeinrichtung angeordnet ist.5. Aerodynamic seal according to one of the preceding claims, characterized in that a suction device is arranged in the space between laterally adjacent slot nozzles (13, 14; 15, 16). 6. Aerodynamische Abdichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß in dem Raum zwischen seitlich benachbarten Schlitzdüsen (13, 14; 15, 16) eine Einrichtung zur Schutzgaseispeisung angeordnet ist. 6. Aerodynamic seal according to one of claims 1 to 4, characterized in that a device for inert gas supply is arranged in the space between laterally adjacent slot nozzles (13, 14; 15, 16). 7. Aerodynamische Abdichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß in dem Raum zwischen seitlich benachbarten Schlitzdüsen (13, 14; 15, 16) ein Brenner angeordnet ist.7. Aerodynamic seal according to one of the preceding claims, characterized in that a burner is arranged in the space between laterally adjacent slot nozzles (13, 14; 15, 16). 8. Aerodynamische Abdichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Raum zwischen seitlich benachbarten Schlitzdüsen (13, 14; 15, 16) jeweils durch eine senkrecht zum durchlaufenden Metallband (3) verlaufende und nahe an dieses heranreichende Trennwand (18) geteilt ist.8. Aerodynamic seal according to one of the preceding claims, characterized in that the space between laterally adjacent slot nozzles (13, 14; 15, 16) each divided by a perpendicular to the continuous metal strip (3) and close to this partition (18) is. 9. Aerodynamische Abdichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß zwischen den einander zugewandten Seiten der Schlitzdüsen (13, 14; 15, 16) eine zum durchlaufenden Metallband (3) parallele Abdeckung angeordnet ist. 9. Aerodynamic seal according to one of claims 1 to 7, characterized in that between the mutually facing sides of the slot nozzles (13, 14; 15, 16) is arranged a cover parallel to the continuous metal strip (3).
PCT/DE1999/002667 1998-10-12 1999-08-26 Gas seal for continuous thermal treatment facilities operated with a protective gas atmosphere Ceased WO2000022363A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
JP2000576225A JP2002527622A (en) 1998-10-12 1999-08-26 Gas seal for continuous heat treatment equipment using protective gas atmosphere
EP99953600A EP1040309B1 (en) 1998-10-12 1999-08-26 Gas seal for continuous thermal treatment facilities operated with a protective gas atmosphere
CA002314143A CA2314143C (en) 1998-10-12 1999-08-26 Gas seal for continuous thermal treatment facilities operated with a protective gas atmosphere
AT99953600T ATE259049T1 (en) 1998-10-12 1999-08-26 GAS SEALING OF CONTINUOUS HEAT TREATMENT SYSTEMS WITH PROTECTIVE GAS ATMOSPHERE
DE59908467T DE59908467D1 (en) 1998-10-12 1999-08-26 GAS SEALING OF CONTINUOUS HEAT TREATMENT PLANTS WITH PROTECTION GASATHOSPHERE
US09/581,370 US6517079B1 (en) 1998-10-12 1999-08-26 Gas seal for continuous thermal treatment facilities operated with a protective gas atmosphere

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19846749A DE19846749C2 (en) 1998-10-12 1998-10-12 Aerodynamic sealing of continuous heat treatment plants with a protective gas atmosphere
DE19846749.4 1998-10-12

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WO2000022363A1 true WO2000022363A1 (en) 2000-04-20

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US (1) US6517079B1 (en)
EP (1) EP1040309B1 (en)
JP (1) JP2002527622A (en)
AT (1) ATE259049T1 (en)
CA (1) CA2314143C (en)
DE (2) DE19846749C2 (en)
ES (1) ES2216578T3 (en)
WO (1) WO2000022363A1 (en)

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WO2018228663A1 (en) * 2017-06-12 2018-12-20 Thyssenkrupp Steel Europe Ag Apparatus and method for separating gas atmospheres

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CA2314143A1 (en) 2000-04-20
ES2216578T3 (en) 2004-10-16
DE19846749A1 (en) 2000-04-27
US6517079B1 (en) 2003-02-11
DE59908467D1 (en) 2004-03-11
ATE259049T1 (en) 2004-02-15
CA2314143C (en) 2004-12-07
JP2002527622A (en) 2002-08-27
EP1040309B1 (en) 2004-02-04
EP1040309A1 (en) 2000-10-04
DE19846749C2 (en) 2000-10-12

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